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2118.000 Thesium
Description of the genus
Annual or perennial herbs or subshrubs, parasitic or hemiparasitic. Leaves sessile, alternate, scale-like or ± linear. Flowers bisexual, solitary or in cymes, each flower subtended by 1, often conspicuous, bract which is often adnate to the pedicel or peduncle and 2 bracteoles or (in T. atrum and T. fastigiatum) by an involucre of 4 or more bracts. Perianth (3-4-)5-lobed, often with conspicuous external glands on the perianth tube below the sinuses of the lobes. Stamens as many as lobes; anthers (in ours) attached to lobes by tufts of hairs. Ovary with 3 ovules. Stigma capitate. Fruit a nut, rarely fleshy, usually 10-ribbed, crowned with the persistent perianth. Worldwide: 325 species in the Old World Malawi: 7 taxa. The larvae of the following species of insect eat species of this genus:
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Links to taxa: View: living plant images - herbarium specimen images - all images for this genus
| Species | FZ divisions | Content |
| dissitum N.E.Br. | S | |
| fastigiatum A.W. Hill | N,C | Description, Image |
| goetzeanum Engl. | N | Description, Image |
| masukense Baker[End] | N | |
| nigricans Rendle | S | Description, Image |
| triflorum L.f. | ||
| whyteanum Rendle | S | Image |
Other sources of information about Thesium:
Our websites:
Flora of Botswana: ThesiumFlora of Mozambique: Thesium
Flora of Zambia: Thesium
Flora of Zimbabwe: Thesium
External websites:
African Plants: A Photo Guide (Senckenberg): ThesiumBHL (Biodiversity Heritage Library): Thesium
EOL (Encyclopedia of Life): Thesium
GBIF (Global Biodiversity Information Facility): Thesium
Google: Web - Images - Scholar
iNaturalist: Thesium
IPNI (International Plant Names Index): Thesium
JSTOR Plant Science: Thesium
Mansfeld World Database of Agricultural and Horticultural Crops: Thesium
Plants of the World Online: Thesium
Tropicos: Thesium
Wikipedia: Thesium
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